Unlike many ornamental grasses, it tolerates heavier clay soil, light shade and seasonal dryness in its planting bed. If you prefer a tidy garden, or if your ornamental grass is a variety that doesn't look great dormant, cut back the grass in fall. Which to prune differently: Stipa gigantea or giant pheasant’s tail grass just needs its dead flower stalks removed in winter. Karl Foerster Feather Reed Grass are a very attractive ornamental grass that grows very well in Calgary. Warm-season grasses begin growing in the spring and are dormant over winter. Pruning Karl foerster feather reed grass should be left until late spring. The dead stalks are attractive and add interest to your landscape if left over winter time. By mid-winter, ornamental grasses have gone completely dormant. Since it’s so common, it’s helpful to know how to care for Karl Foerster feather reed grass. Leave foliage standing over winter, for habitat and visual interest. However, many grasses add terrific winter interest in the landscape, adding movement and texture when much of the garden is asleep. Cool-season grasses include feather reed grasses (Calamagrostis spp.) February is a good time to cut Hair Grass back to a height of 3 inches. Divide warm-season grasses in late winter and cool-season grasses in early fall. Feather Reed Grass at Mather Commerce Center Tufted Hair Grass (Deschampsia cespitosa) is grown for it’s flower plumes, which should be attractive into the Winter. But as Roger explained when pots are frozen and not covered they hold water on top of the soil because it is frozen and that water will rot the crown of the grass. Cut back in late winter or spring before new growth emerges. When they do freeze they stay frozen longer and are not constantly going through the freeze/thaw cycle that they would uncovered in a mild winter. We are in Zone 3 ... Q. Feather Reed Grass - I planted a Feather Reed Grass four seasons ago and it has done wonderful with full heads. Maidenhair grass (Miscanthus), for example, is a more likely flopper than feather reed grass (Calamagrostis). Believe it or not, wintertime is a perfect time for ornamental grass care! Warm season grasses turn brown in winter. You’ll see some new ones starting soon! Karl foerster are very easy to prune, much easier in […] "Karl Foerster" feather reed grass prefers a moist, fertile, sunny spot but adapts readily to other conditions. Not only is it easy to do, cutting back in the winter lets you get a head start before the onslaught of spring landscaping and garden chores hit hard. It’s also used very effectively in large containers on patios and terraces. Plus, Feather Reed Grass is super winter hardy, and requires almost no care. ... End of winter is an ideal time to dig and divide ornamental grasses. Wondering if I should cut back reed grass before winter. 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